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1. Use DAC60508ZRTET to output 0~5V, circuit as the pucture.
2. Internal reference 2.5V by default, DMM measure 2.5V(About 2.496V) on PIN1(REF) of some chips, but others is 2.38V.
3. Change C903(1uF) to 470nF or 2.2uF, voltage not change on PIN1(also 2.38V)
Could you help me analyze this issue? Is it circuit issue or chip issue?
Thanks a lot!
您好,
这部分电路没看出有什么问题,Internal Reference Voltage上电后没有进行其他操作直接测量就是2.38V吗?测量时DAC60508的VDD 和VIO供电电压正常吗?异常板和正常板是一样的原理图和PCB设计吗?异常板和正常板您做过交叉验证吗,结果是怎样的?另外,请确认所使用芯片最终进货来源为TI